Addmaths question

Question

Can anyone show the working on lg -6= 0.77815125 + 1.36437635 i or lg -6 =undefined

*Note that the first answer is from google(so I am not so sure about it)

Comments

And yes, in common logarithm, log x = y
 x > 0.
So log (-6) is undefined.

Answer 1

Please google the differences between common logarithm (base 10) vs natural logarithm (base e).

Value of e is 2.71828128

i is an imaginary number where i² = -1

Solution as requested in attached photo, 

Comments

Thanks for your clear and detailed explanation!

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Am I going to learn about "euler's identity" in form 5 addmaths?(I am going to be form 5 in the month of March)

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Sorry I am not quite sure, I am not a local student (yet my children is, I opened this account for my children).

it's enough to know the formula exists for the meantime, and you may  ask your teacher later once school commences.

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alright thanks!